Geometry-related magnetic interference patterns in long SNS Josephson junctions
Entity
UAM. Departamento de Física Teórica de la Materia CondensadaPublisher
American Physical SocietyDate
2012-08-09Citation
10.1103/PhysRevB.86.064510
Physical Review B 86.6 (2012): 064510
ISSN
1550-235X (online); 1098-0121 (print)DOI
10.1103/PhysRevB.86.064510Funded by
This work was supported by RTRA Triangle de la Physique NanoMan and ANR QuantADNEditor's Version
http://dx.doi.org/10.1103/PhysRevB.86.064510Subjects
FísicaRights
© 2012 American Physical SocietyAbstract
We have measured the critical current dependence on the magnetic flux of two long SNS junctions differing by the normal wire geometry. The samples are made by a Au wire connected to W contacts, via focused ion beam assisted deposition. We could tune the magnetic pattern from the monotonic Gaussian-like decay of a quasi-one-dimensional (1D) normal wire to the Fraunhofer-like pattern of a square normal wire. We explain the monotonic limit with a semiclassical 1D model, and we fit both field dependencies with numerical simulations of the two-dimensional Usadel equations. Furthermore, we observe both integer and fractional Shapiro steps. The magnetic flux dependence of the integer steps reproduces as expected that of the critical current I c, while fractional steps decay slower with the flux than I c
Files in this item
Google Scholar:Chiodi, F.
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Ferrier, M.
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Guéron, S.
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Cuevas Rodríguez, Juan Carlos
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Montambaux, G.
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Fortuna, Fabiola
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Kasumov, A.
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Bouchiat, H.
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